Guest A Martin Posted May 1, 2020 Report Share Posted May 1, 2020 I have two mbx660 mains powered smoke detectors and recently I experienced chirping which I discovered was related to back up battery which I replaced. All good. The other smoke detector has now had the same problem however when I change the battery the alarm goes off and only stops when I remove the battery. Can you advise what the issue may be? Quote Link to comment Share on other sites More sharing options...
Safelincs Posted May 3, 2020 Report Share Posted May 3, 2020 Hi, could it be that the alarms are older than 10 years? In which case they might require replacing. Harry Quote Link to comment Share on other sites More sharing options...
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